Landfill composition and method of producing the same

ABSTRACT

A landfill composition containing no free liquid as determined by the paint filter test protocol wherein a 100 ml sample of the landfill composition containing an industrial waste product, placed in a 400 micron conical paint filter for five minutes, passes no water through the filter, is produced by admixing the industrial waste product with 5 to 80 weight percent, based on the total solids content of the industrial waste product, of finely grounded granulated blast furnace slag comprising 30-40 percent SiO 2 , 40-45 percent CaO, 10-20 percent Al 2  O 3 , 3-10 percent MgO, 1-3 percent S, 0.3-3 percent MnO, 0.3 percent Fe 2  O 3  and a trace of phosphorous, the finely ground granulated blast furnace slag having a Blaine particle size of about 1,800-6,000 sq.cm/g.

BACKGROUND OF THE INVENTION

The present invention relates to a landfill composition and to a process for producing said landfill composition which contains no free liquid as determined by the paint filter test protocol.

This paint filter test protocol is described in the Federal Register, Vol. 47, No. 38, page 8311 and requires that a 100 ml sample of said composition placed in a 400 micron conical paint filter for five minutes passes no water through said filter.

The disposal of industrial waste materials presents significant economic and ecological problems for manufacturers and municipalities. While at times it has been found appropriate and possible to incinerate certain types of industrial wastes, often as not industrial wastes have been treated with various products to convert them to a disposable form. Notwithstanding such prior art processes, the conversion of industrial wastes to a landfill meeting the above-identified "no free liquid" criteria has up to now been difficult and/or economically unfeasible, especially when it is desired that the resulting landfill composition exhibits load supportive properties and any toxic pollutants contained therein are essentially non-leachable by virtue of being fixed in the load supportive, highly impermeable mass.

SUMMARY OF THE INVENTION

In one aspect, the present invention relates to a process for converting industrial waste products into a landfill containing no free liquid as determined by the paint filter test protocol wherein a 100 ml sample of a composition containing said industrial waste, placed in a 400 micron conical paint filter for five minutes, passes no water through said filter, said process comprising adding to said industrial waste in an amount ranging from about 5 to 80 weight percent and preferably about 5 to 30 weight percent, based on the total solids content in said industrial waste, of a stabilizer comprising finely ground granulated blast furnace slag comprising 30-40 percent SiO₂, 40-45 percent CaO, 10-20 percent Al₂ O₃, 3-10 percent MgO, 1-3 percent S, 0.3-3 percent MnO, 0.3 percent Fe₂ O₃ and a trace of phosphorous, said finely ground granulated blast furnace slag having a Blaine particle size of about 1,800-6,000 sq.cm./g.

DETAILED DISCUSSION

The industrial waste materials convertible to the landfill composition of the present invention can be those produced, for instance, by industries such as energy producing manufacturers, waste water treatment facilities, by food processors and the like.

The solids content of such industrial wastes generally comprises 1-40 weight percent MgO; 0-25 weight percent V₂ O₅ ; 1-55 weight percent SiO₂ ; 1-85 weight percent Al₂ O₃ ; 0.2-25 weight percent Na₂ O; 4-35 weight percent Fe₂ O₃ ; 1-10 weight percent NiO; 2-55 weight percent CaO; 0.3-4 weight percent SO₃ ; 0-3 weight percent K₂ O; 0-1 weight percent ZnO; 0-4 weight percent P₂ O₅ and 0-3 weight percent TiO₂.

In one preferred embodiment of the present invention, the industrial waste product employed has the following composition: 1-17 weight percent MgO; 0-12 weight percent V₂ O₅ ; 1-50 weight percent SiO₂ ; 1-30 weight percent Al₂ O₃ ; 0.5-2 weight percent Na₂ O; 8-35 weight percent Fe₂ O₃ ; 1-4 weight percent NiO; 2-55 weight percent CaO; 1-4 weight percent SO₃ ; 3 weight percent K₂ O; 1 weight percent ZnO; 4 weight percent P₂ O₅ and 1-3 weight percent TiO₂.

In another preferred embodiment, the industrial waste has the following composition: 8-17 weight percent MgO; 1-6 weight percent V₂ O₅ ; 1-4 weight percent SiO₂ ; 10-22 weight percent Al₂ O₃ ; 0.5-1.0 weight percent Na₂ O; 11-35 weight percent Fe₂ O₃ ; 1-2 weight percent NiO; 20-55 weight percent CaO; and 1-2 weight percent SO₃.

Representative ones of such industrial waste compositions include the following. The amounts of the components of these compositions are those within experimental error.

(1) a waste composition containing: MgO-5 wt%; V₂ O₅ -6 wt%; SiO₂ -24 wt%; Al₂ O₃ -22 wt%; Na₂ O-2 wt%; Fe₂ O₃ -23 wt%; NiO-2 wt%; CaO-8 wt%; SO₃ -4 wt%; ZnO-1 wt%; K₂ O-3 wt%;

(2) a waste material having a composition comprising: MgO-3 wt%; SiO₂ -47 wt%; Al₂ O₃ -27wt%; Na₂ O-1 wt%; Fe₂ O₃ -14 wt%; CaO-2 wt%; SO₃ -2 wt%; K₂ O-3 wt%; TiO₂ -2 wt%;

(3) a waste composition comprising: MgO-1 wt%; V₂ O₅ -2 wt%; SiO₂ -13 wt%; Al₂ O₃ -52 wt%; Na₂ O-0.2 wt%; Fe₂ O₃ -19 wt%; NiO-5 wt%; CaO-5 wt%; TiO₂ -1 wt%; K₂ O-1.0 wt%; SO₃ -0.3 wt%;

(4) a sludge composition comprising: MgO-12 wt%; V₂ O₅ -12 wt%; SiO₂ -4 wt%; Al₂ O₃ -34 wt%; Na₂ O-1.0 wt%; Fe₂ O₃ -18 wt%; NiO-1 wt%; CaO-16 wt%; TiO₂ -0.25 wt%; K₂ O-0.25 wt%; SO₃ -0.5 wt%;

(5) a waste composition comprising: MgO-8 wt%; V₂ O₅ -1 wt%; SiO₂ -4 wt%; Al₂ O₃ -22 wt%; Na₂ O-0.5 wt%; Fe₂ O₃ -20 wt%; NiO-2 wt%; CaO-40 wt%; TiO₂ -0.25 wt%; K₂ O-0.25 wt%; SO₃ -1.0 wt%;

(6) a waste composition comprising: MgO-11 wt%; V₂ O₅ -6 wt%; SiO₂ -1 wt%; Al₂ O₃ -22 wt%; Na₂ O-0.6 wt%; Fe₂ O₃ -35 wt%; NiO-2 wt%; CaO-20 wt%; SO₃ -1.4 wt%; and

(7) a waste composition comprising: MgO-17 wt%; V₂ O₅ -1 wt%; SiO₂ -2 wt%; Al₂ O₃ -11 wt%; Na₂ O-1.0 wt%; Fe₂ O₃ -12 wt%; NiO-1 wt%; CaO-52 wt%; TiO₂ -0.25 wt%; K₂ O-0.25 wt%; SO₃ -1.5 wt%.

Still another representative industrial waste composition employed in the practice of the present invention is one having the following composition:

    ______________________________________                                                         Typical Range in                                                               Concentration                                                                  (mg/kg dry weight)                                             ______________________________________                                         Chemical                                                                       Total phosphorous 2,000-3,000                                                  Total Kjeldahl nitrogen                                                                          100-280                                                      Arsenic           10-25                                                        Cadmium           12-65                                                        Chromium          100-800                                                      Copper            250-400                                                      Mercury             1-1.5                                                      Manganese         100-300                                                      Nickel            100-200                                                      Zinc               4,000-12,000                                                Lead              100-700                                                      Total organic carbon                                                                             20,000-28,000                                                Phenol            2-5                                                          Oil and Grease     62,000-150,000                                              Total PCB         30-40                                                        Aldrin             3                                                           Naphthalene       2,000                                                        Fluorene          69                                                           Phenanthrene      200                                                          Fluoroanthene     150                                                          Acenaphthene      22                                                           Acenaphthylene    96                                                           Pyrene            140                                                          Chrysene          92                                                           Benzo (k) fluoranthene                                                                           140                                                          Benzo (a) pyrene  87                                                           Benzo (b) fluoranthene                                                                           140                                                          Benzo (a) anthracene                                                                             86                                                           Indeno (1,2,3,-c,d) pyrene                                                                       50                                                           Physical                                                                       % moisture         50-80%                                                      Specific gravity of solids                                                                       2.50-2.54                                                    Hydraulic conductivity                                                                           10.sup.-8 cm/sec                                             ______________________________________                                    

The stabilizer which is added to the industrial waste so as to provide a landfill composition containing no free water as defined above is a ground, granulated blast furnace slag comprising 30-40 percent SiO₂, 40-45 percent CaO, 10-20 percent Al₂ O₃, 3-10 percent MgO, 1-3 percent S, 0.3-3 percent MnO, 0.3 percent Fe₂ O₃ and a trace of phosphorous, said finely ground granulated blast furnace slag having a Blaine particle size of about 1,800-6,000 sq.cm./g.

This stabilizer is employed in an amount ranging from about 5 to 80 weight percent based on the solids content of said industrial waste material.

It has also been found convenient in one embodiment of the present invention to add quick lime to the industrial waste material in an amount ranging from about 5 to 20 weight percent.

In still another embodiment of the present invention it has been found advantageous to add calcium stearate to the industrial waste material in an amount ranging from about 5 to 10 weight percent based on the solids content of said industrial waste material.

Yet another embodiment of the present invention involves the addition of about 15-20 weight percent of sodium silicate based on the solids content of the industrial waste material.

It has also been found advantageous to admix about 20-300 weight percent fly ash with the stabilized industrial waste, based on the solids content of the industrial waste material, so as to provide the landfill composition of the present invention.

As noted above, the landfill composition of the present invention is one containing no free liquid as determined by the paint filter test protocol wherein a 100 ml sample of a composition containing said industrial waste material, placed in a 400 micron conical paint filter for five minutes, passes no water through said filter. These filters are commercially available in paint and hardware stores. Accordingly, the present invention is also concerned with such a landfill composition comprising the untreated industrial waste material and from about 5 to 80 weight percent, based on the total solids content thereof, of the finely ground granulated blast furnace slag stabilizer as defined above.

This landfill composition can also include, if desired, one or more of the following adjuvants in the following indicated amounts, based on the solids content of the industrial waste material: about 5-20 weight percent quick lime; about 5-10 weight percent calcium stearate; about 15-20 weight percent sodium silicate; and about 20-300 weight percent fly ash.

The landfill composition of the present invention, after a period of time ranging from about 4 to 90 days and preferably about 21 to 60 days, can develop a load supportive property ranging from about 0.5-4.5+ tons/ft² and preferably about 3 tons/ft² and higher and a water permeability of about 1×10⁻⁶ cm² /sec or less.

A further advantage of the landfill composition of the present invention is that the landfill composition will stabilize underwater and that the landfill composition can be placed in layers with each successive layer stabilizing to the desired degree, whether the placement of the layers takes place underwater or not.

The following non-limiting examples are given to illustrate the present invention.

In all the Examples the stabilizer is a finely ground granulated blast furnace slag comprising 30-40 percent SiO₂, 40-45 percent CaO, 10-20 percent Al₂ O₃, 3-10 percent MgO, 1-3 percent S, 0.3-3 percent MnO, 0.3 percent Fe₂ O₃ and a trace of phosphorous, said finely ground granulated blast furnace slag having a Blaine particle size of about 1,800-6,000 sq.cm./g.

In Examples I-III the industrial waste material has the following composition and characteristics:

    ______________________________________                                                         Typical Range in                                                               Concentration                                                                  (mg/kg dry weight)                                             ______________________________________                                         Chemical                                                                       Total phosphorous 2,000-3,000                                                  Total Kjeldahl nitrogen                                                                          100-280                                                      Arsenic           10-25                                                        Cadmium           12-65                                                        Chromium          100-800                                                      Copper            250-400                                                      Mercury             1-1.5                                                      Manganese         100-300                                                      Nickel            100-200                                                      Zinc               4,000-12,000                                                Lead              100-700                                                      Total Organic Carbon                                                                             20,000-28,000                                                Phenol            2-5                                                          Oil and Grease     62,000-150,000                                              Total PCB         30-40                                                        Aldrin             3                                                           Naphthalene       2,000                                                        Fluorene          69                                                           Phenanthrene      200                                                          Fluoranthene      150                                                          Acenaphthene      22                                                           Acenaphthylene    96                                                           Pyrene            140                                                          Chrysene          92                                                           Benzo (k) fluoranthene                                                                           140                                                          Benzo (a) pyrene  87                                                           Benzo (b) fluoranthene                                                                           140                                                          Benzo (a) anthracene                                                                             86                                                           Indeno (1,2,3,-c,d) pyrene                                                                       50                                                           Physical                                                                       % moisture         50-80%                                                      Specific gravity of solids                                                                       2.50-2.54                                                    Hydraulic conductivity                                                                           10.sup.-8 cm/sec                                             ______________________________________                                    

EXAMPLE I

The above industrial waste material dewatered to a 50% solids content was admixed with the stabilizer, defined above, in each of Samples 1-5 below in the amounts indicated.

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1     211.5 g industrial waste                                                                       105.75    7.5    15.0                                          15.8 g stabilizer                                                                              15.80                                                    2     203.4 g industrial waste                                                                       101.70    5.0    10.0                                          10.15 g stabilizer                                                                             10.15                                                    3     216.0 g industrial waste                                                                       108.00    10.0   20.0                                          21.6 g stabilizer                                                                              21.60                                                    4     191.2 g industrial waste                                                                       95.60     2.5    5.0                                           4.78 g stabilizer                                                                              4.78                                                     5     192.0 g industrial waste                                                                       96.0      5.0    10.0                                          9.6 g stabilizer                                                                               9.6                                                            4.8 g quick lime                                                                               4.8                                                      ______________________________________                                    

    ______________________________________                                         Penetrometer Readings - after 60 days                                                 Sample                                                                               Tons/ft.sup.2                                                     ______________________________________                                                1     2.0                                                                      2     3.0                                                                      3     4.5                                                                      4     0                                                                        5     .5                                                                ______________________________________                                    

The above samples passed the paint filter test conducted in accordance with the protocol noted above, thus establishing that the resulting stabilized material is suitable as a landfill composition.

EXAMPLE II

Each of samples 1A, 2A, 3A, 4A, 5A and 6A was placed in an incubator maintained at a temperature of 38° C. Each of samples 1B, 2B, 3B, 4B, 5B and 6B was maintained at ambient temperature. The above-identified industrial waste was dewatered to 50 percent solids content.

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Samples                                                                               Composition    Solids    Sludge Solids                                  ______________________________________                                         1 A&B  200 g industrial waste                                                                        100       10.0   18.2                                           20 g stabilizer                                                                               20                                                              10 g quick lime                                                                               10                                                       2 A&B  200 g industrial waste                                                                        100       7.5    13.0                                           15 g stabilizer                                                                               15                                                              15 g quick lime                                                                               15                                                       3 A&B  200 g industrial waste                                                                        100       5.0    9.1                                            10 g stabilizer                                                                               10                                                              5 g quick lime  5                                                              5 g calcium stearate                                                                           5                                                       4 A&B  200 g industrial waste                                                                        100       10.0   16.7                                           20 g stabilizer                                                                               20                                                              10 g quick lime                                                                               10                                                              10 g calcium stearate                                                                         10                                                       5 A&B  200 g industrial waste                                                                        100       10.0   16.7                                           20 g stabilizer                                                                               20                                                              20 g quick lime                                                                               20                                                       6 A&B  200 g industrial waste                                                                        100       10.0   16.7                                           20 g stabilizer                                                                               20                                                              20 g quick lime                                                                               20                                                              20 ml sodium silicate                                                   ______________________________________                                    

    ______________________________________                                         Penetrometer Readings - after about 60 days                                           Samples                                                                               Tons/ft.sup.2                                                    ______________________________________                                                1 A&B  4.5+                                                                    2 A&B  3.2                                                                     3 A&B  4.5+                                                                    4 A&B  4.5+                                                                    5 A&B  4.5+                                                                    6 A&B  4.5+                                                             ______________________________________                                    

The above samples passed the paint filter test conducted in accordance with the protocol noted above, thus establishing that the resulting stabilized industrial waste material is suitable as a landfill composition.

EXAMPLE III

Each of Samples 1A, 2A, 3A and 4A was placed in an incubator maintained at a temperature of approximately 38° C. Each of Samples 1B, 2B, 3B and 4B was maintained at ambient temperature. The above-identifed industrial waste was dewatered to 50 percent solids content.

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample Composition    Solids    Sludge Solids                                  ______________________________________                                         1 A&B  200 g industrial waste                                                                        100       10.0   18.2                                           20 g stabilizer                                                                               20                                                              10 g quick lime                                                                               10                                                              10 ml sodium silicate                                                   2 A&B  200 g industrial waste                                                                        100       10.0   19.0                                           20 g stabilizer                                                                               20                                                              5 g quick lime  5                                                              5 ml sodium silicate                                                    3 A&B  200 g industrial waste                                                                        100       10.0   17.3                                           20 g stabilizer                                                                               20                                                              15 g quick lime                                                                               15                                                              10 ml sodium silicate                                                   4 A&B  200 g industrial waste                                                                        100       10.0   17.3                                           20 g stabilizer                                                                               20                                                              15 g quick lime                                                                               15                                                              5 ml sodium silicate                                                    ______________________________________                                    

    ______________________________________                                         Penetrometer Readings - after about 21 days                                           Samples                                                                               Tons/ft.sup.2                                                    ______________________________________                                                1 A&B  4.5+                                                                    2 A&B  4.5+                                                                    3 A&B  4.5                                                                     4 A&B  4.5+                                                             ______________________________________                                    

The above samples passed the paint filter test conducted in accordance with the protocol noted above, thus establishing that the resulting stabilized industrial waste material is suitable as a landfill composition.

In Examples IV-X the industrial waste material employed has the following average compositions: 1-17 weight percent MgO; 1-50 weight percent SiO₂ ; 1-30 weight percent Al₂ O₃ ; 0.5-2 weight percent Na₂ O; 8-35 weight percent Fe₂ O₃ ; 1-4 weight percent NiO; 2-55 weight percent CaO; 1-4 weight percent SO₃ ; 3 weight percent K₂ O; 1 weight percent ZnO; 4 weight percent P₂ O₅ ; and 1-3 weight percent TiO₂.

EXAMPLE IV

The above industrial waste material was dewatered to a 12 percent solids concentration and employed to produce the following landfill compositions:

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1A    200.0 g industrial waste                                                                       24.0      7.25   14.8                                          73.5 g fly ash  73.5                                                           14.5 g stabilizer                                                                              14.5                                                     1B    200.0 g industrial waste                                                                       24.0      12.00  24.6                                          73.5 g fly ash  73.5                                                           24.0 g stabilizer                                                                              24.0                                                     2A    200.0 g industrial waste                                                                       24.0      3.60   15                                            24.0 g fly ash  24.0                                                           7.2 g stabilizer                                                                                7.2                                                     2B    200.0 g industrial waste                                                                       24.0      6.00   25                                            24.0 g fly ash  24.0                                                           12.0 g stabilizer                                                                              12.0                                                     ______________________________________                                    

Samples 1A, 1B and 2B passed the paint filter test conducted in accordance with the protocol noted above, i.e. no free liquor was noted at the completion of the 5-minute test. The composition of Sample 2A was moist and soft.

EXAMPLE V

The above industrial waste was dewatered to 50 percent solids and employed to produce the following landfill compostions:

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1     200 g industrial waste                                                                         40        7.5    15.0                                          60 g fly ash    60                                                             15 g stabilizer 15                                                       2     200 g industrial waste                                                                         40        5.0    10.0                                          60 g fly ash    60                                                             10 g stabilizer 10                                                       3     200 g industrial waste                                                                         40        2.5    5.0                                           60 g fly ash    60                                                             5 g stabilizer   5                                                       ______________________________________                                    

    ______________________________________                                         Penetrometer Readings - after about 5 weeks and about 61/2                     months, respectively.                                                          Sample         Tons/ft.sup.2                                                                           Tons/ft.sup.2                                          ______________________________________                                         1              4.5+     4.5+                                                   2              3.0      4.0                                                    3              --       --                                                     ______________________________________                                    

The above samples passed the paint filter test conducted in accordance with the protocol noted above, thus establishing that the stabilized industrial waste is suitable as a landfill material.

EXAMPLE VI

The above industrial waste material was dewatered to about 50 percent solids and employed to produce the following landfill compositions:

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1     200 g industrial waste                                                                         100       23.0   23.0                                          100 g fly ash   100                                                            45 g stabilizer 45                                                       2     134 g industrial waste                                                                         67        15.0   15.0                                          66 g fly ash    66                                                             20 stabilizer   20                                                       3     67 g industrial waste                                                                          33        0      0                                             33 g fly ash    33                                                             no stabilizer    0                                                       ______________________________________                                    

    ______________________________________                                         Penetrometer Readings - after about 5 weeks                                           Sample                                                                               Tons/ft.sup.2                                                     ______________________________________                                                1     4.5                                                                      2     4.5                                                                      3     0                                                                 ______________________________________                                    

Samples 1 and 2 passed the paint filter test conducted in accordance with the protocol noted above, thus establishing that the compositions of Samples 1 and 2 are suitable as landfill material.

EXAMPLE VII

The above industrial waste material was dewatered to about 9 percent solids and employed to produce the following landfill compositions:

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1     200 g industrial waste                                                                         18        15.0   44.0                                          50 g fly ash    50                                                             30 g stabilizer 30                                                       2     200 g industrial waste                                                                         18        7.5    22.0                                          50 g fly ash    50                                                             15 g stabilizer 15                                                       3     200 g industrial waste                                                                         18        15.0   69.7                                          25 g fly ash    25                                                             30 g stabilizer 30                                                       4     200 g industrial waste                                                                         18        7.5    34.8                                          25 g fly ash    25                                                             15 g stabilizer 15                                                       ______________________________________                                    

    ______________________________________                                         Penetrometer Readings - after 2 weeks and 51/2 months,                         respectively.                                                                  Sample         Tons/ft.sup.2                                                                           Tons/ft.sup.2                                          ______________________________________                                         1              4.50      4.5+                                                  2              .50      3.5                                                    3              4.00     4.5                                                    4              .25      2.5                                                    ______________________________________                                    

The above samples passed the paint filter test conducted in accordance with the protocol noted above, thus establishing that they are suitable as landfill material.

EXAMPLE VIII

The above industrial waste material was dewatered to 50 percent solids and employed to produce the following landfill compositions:

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1     200 g industrial waste                                                                         100       2.5    5.0                                           5 g stabilizer   5                                                       2     200 g industrial waste                                                                         100       5.0    10.0                                          10 g stabilizer 10                                                       3     200 g industrial waste                                                                         100       10.0   20.0                                          20 g stabilizer 20                                                       4     200 g industrial waste                                                                         100       15.0   30.0                                          30 g stabilizer 30                                                       ______________________________________                                    

    ______________________________________                                         Penetrometer Readings - after about one month and 41/2                         months, respectively.                                                                        1 Month  4.5 Months                                              Sample        Tons/ft.sup.2                                                                           Tons/ft.sup.2                                           ______________________________________                                         1             0.5      3.5+                                                    2             1.0      4.5                                                     3             3.0      4.5+                                                    4             4.5      4.5+                                                    ______________________________________                                    

The above samples passed the paint filter test conducted in accordance with the protocol noted above, thus estabilishing that they are suitable as landfill material.

EXAMPLE IX

The above industrial waste material was dewatered to 50 percent solids for Sample 1 below while it was dewatered to 60 percent solids for Samples 2 and 3. All were then used to produce the following landfill compositions:

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1     200 g industrial waste                                                                         100       40     80                                            200 g water                                                                    80 g stabilizer 80                                                       2     200 g industrial waste                                                                         120                                                            200 g water                                                                    80 g stabilizer 80                                                       3     300 g industrial waste                                                                         180       7.3    11.8                                          22 g stabilizer 22                                                             5 g quick lime   5                                                             24 g water                                                               ______________________________________                                    

    ______________________________________                                         Penetrometer Readings - after about 30 days.                                          Sample                                                                               Tons/ft.sup.2                                                     ______________________________________                                                1     4.5+                                                                     2     4.5+                                                                     3     4.5+                                                              ______________________________________                                    

The above samples passed the paint filter test conducted in accordance with the protocol noted above, thus estabilishing that they are suitable as landfill material.

EXAMPLE X

The above industrial waste material was dewatered to 50 percent solids and employed to produce the following landfill composition.

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1     200 g industrial waste                                                                         100       10     20                                            20 g stabilizer 20                                                             2 g potassium chloride                                                                          2                                                       2     200 g industrial waste                                                                         100       15     30                                            30 g stabilizer 30                                                             2 g potassium chloride                                                                          2                                                       ______________________________________                                    

    ______________________________________                                         Penetrometer Readings - after about 3 months                                          Sample                                                                               Tons/ft.sup.2                                                     ______________________________________                                                1     4.5+                                                                     2     4.5+                                                              ______________________________________                                    

EXAMPLE XI

The above industrial waste was dewatered to 50 to 50 percent solids and employed to produce the following landfill compositions:

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1     600 g industrial waste                                                                         300        7.5.  15.0                                          45 g stabilizer 45                                                       2     600 g industrial waste                                                                         300       7.5    13.6                                          45 g stabilizer 45                                                             30 g quick lime 30                                                       3     600 g industrial waste                                                                         300       5.0    9.5                                           30 g stabilizer 30                                                             15 g quick lime 15                                                       ______________________________________                                    

    ______________________________________                                         Penetrometer Readings                                                                 Sample                                                                               Tons/ft.sup.2                                                     ______________________________________                                                1      2.0+                                                                    2     2.0                                                                      3     1.5                                                               ______________________________________                                    

EXAMPLE XII

To the above industrial waste there was added 10 weight percent water. The resulting mixture was employed to produce the following landfill compositions:

    ______________________________________                                                      Grams of Stabilizer as % of                                       Sample Composition Solids     Sludge Solids                                    ______________________________________                                         1      600 g mixture                                                                              300        10     20                                               60 g stabilizer                                                                            60                                                          2      743 g mixture                                                                              371.5      18     36                                               134 g stabilizer                                                                           134                                                         ______________________________________                                    

    ______________________________________                                         Penetrometer Readings                                                                 Sample                                                                               Tons/ft.sup.2                                                     ______________________________________                                                1     4.5+                                                                     2     4.5+                                                              ______________________________________                                    

EXAMPLE XIII

The above industrial waste was employed to produce the following landfill compositions:

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1     100 g industrial waste                                                                         75        10     12.5                                          5 g quick lime   5                                                             10 g stabilizer 10                                                             65 ml water                                                              2     100 g industrial waste                                                                         75         5     6.3                                           5 g quick lime   5                                                             5 g stabilizer   5                                                             60 ml water                                                              3     100 g industrial waste                                                                         75        20     25                                            5 g quick lime   5                                                             20 g stabilizer 20                                                             100 ml water                                                             4     100 g industrial waste                                                                         75        10     13.3                                          10 g stabilizer 10                                                             60 ml water                                                              ______________________________________                                    

    ______________________________________                                         Penetrometer Readings                                                                 Sample                                                                               Tons/ft.sup.2                                                     ______________________________________                                                1     4.5+                                                                     2     4.5                                                                      3     4.5+                                                                     4     4,5                                                               ______________________________________                                    

EXAMPLE XIV

The above industrial waste was diluted from its "as dredged" 85% solids state to 50% solids by the addition of water and employed to produce the following landfill compositions:

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1     200 g industrial waste                                                                         100       15     28.6                                          30 g stabilizer  30                                                            5 g quick lime   5                                                       2     200 g industrial waste                                                                         100       10     19.0                                          20 g stabilizer  20                                                            5 g quick lime   5                                                       3     200 g industrial waste                                                                         100        5     9.5                                           10 g stabilizer  10                                                            5 g quick lime   5                                                       4     200 g industrial waste                                                                         100       10     19.0                                          20 g stabilizer  20                                                            5 g sodium silicate                                                                             5                                                       ______________________________________                                    

    ______________________________________                                         Penetrometer Readings                                                                 Sample                                                                               Tons/ft.sup.2                                                     ______________________________________                                                1     4.5+                                                                     2     4.5+                                                                     3     --                                                                       4     --                                                                ______________________________________                                    

EXAMPLE XV

The below tests were conducted to determine if the composition would set up under water. The above industrial waste was employed and Samples 1 and 2 were diluted to 15% solids. Samples 3, 4 and 5 were "as dredged", i.e. 60% solids. Approximately 1" of water was added to the top of sample 5 only. Samples 1 and 2 provided their own supernatant.

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1     200 g industrial waste                                                                         30         5     33.0                                          10 g stabilizer 10                                                       2     200 g industrial waste                                                                         30        10     67.0                                          20 g stabilizer 20                                                       3     200 g industrial waste                                                                         120        5     8.3                                           10 g stabilizer 10                                                       4     200 g industrial waste                                                                         120       10     16.7                                          20 g stabilizer 20                                                       5     200 g industrial waste                                                                         120       10     16.7                                          20 g stabilizer 20                                                       ______________________________________                                    

    ______________________________________                                         Penetrometer Readings                                                          Sample         Tons/ft.sup.2                                                                           Tons/ft.sup.2                                          ______________________________________                                         1              -1.0     4.5                                                    2              4.5+     4.5+                                                   3              2.25     3.5                                                    4              4.5      4.5                                                    5              4.5+     4.5+                                                   ______________________________________                                    

EXAMPLE XVI

The following test was carried out to determine if the composition would set up in multiple layers.

    ______________________________________                                                         Grams of                                                                               Stabilizer as % of                                     Sample                                                                               Composition     Solids    Sludge Solids                                  ______________________________________                                         1     200 g industrial waste                                                                         107       7.5    14.0                                          15 g stabilizer  15                                                      ______________________________________                                    

    ______________________________________                                         Layer No.    Day of Layering                                                   ______________________________________                                         1            Day 1                                                             2            Day 2                                                             3            Day 3                                                             4            Day 6                                                             5            Day 7                                                             ______________________________________                                    

    ______________________________________                                         Penetrometer Readings                                                                                 Tons/ft.sup.2                                           Layer No.     Tons/ft.sup.2                                                                           (˜90 days later)                                  ______________________________________                                         1             3.5       4.5+                                                   2             1.5       4.5+                                                   3             1.0      4.5                                                     4             1.0      4.5                                                     5             1.0      4.5                                                     ______________________________________                                     

What is claimed is:
 1. A process for converting industrial waste product into a landfill composition containing essentially no free liquid as determined by the paint filter test protocol wherein a 100 ml sample of said composition containing said industrial waste product, placed in a 400 micron conical paint filter for five minutes, passes no water through said filter, said process comprising adding to said industrial waste product in an amount ranging from about 5 to 80 weight percent based on the total solids content in said industrial waste product of finely ground granulated blast furnace slag comprising 30-40 percent SiO₂, 40-45 percent CaO, 10-20 percent Al₂ O₃, 3-10 percent MgO, 1-3 percent S, 0.3-3 percent MnO, 0.3 percent Fe₂ O₃ and a trace of phosphorous, said finely ground granulated blast furnace slag having a Blaine particle size of about 1,800-6,000 sq.cm./g and permitting said landfill composition to develop after a period of time ranging from about 4 to 90 days a load supportive property ranging from about 0.5 to about 4.5 tons/ft² and a water permeability of about 1×10⁻⁶ cm² / sec or less.
 2. The process of claim 1 wherein from about 5 to 30 weight percent, based on the total solids content in said industrial waste product, of said finely divided ground granulated blast furnace slag is added to said industrial waste product.
 3. The process of claim 1 wherein the solids content of said industrial waste product comprises 1-40 weight percent MgO; 0-25 weight percent V₂ O₅ ; 1-55 weight percent SiO₂ ; 1-85 weight percent Al₂ O₃ ; 0.2-25 weight percent Na₂ O; 4-35 weight percent Fe₂ O₃ ; 1-10 weight percent NiO; 2-55 weight percent CaO; 0.3-4 weight percent SO₃ ; 0-3 weight percent K₂ O; 0-1 weight percent ZnO; 0-4 weight percent P₂ O₅ and 0-3 weight percent TiO₂.
 4. The process of claim 3 which also includes adding calcium stearate in an amount ranging from 5-10 weight percent based on the solids content of said industrial waste product.
 5. The process of claim 3 which also includes adding sodium silicate in an amount of about 15-20 weight percent based on the solids content of said industrial waste product.
 6. The process of claim 1 which also includes adding quick lime to said industrial waste product in an amount ranging from 5-20 weight percent based on the solids content of said industrial waste product.
 7. The process of claim 1 which also includes adding fly ash in an amount of about 20-300 weight percent based on the solids content of said industrial waste product.
 8. The process of claim 1 wherein said industrial waste product has the following composition expressed in mg/kg dry weight: total phosphorous-2,000 to 3,000; total Kjeldahl nitrogen-100 to 280; arsenic-10 to 25; cadmium-12 to 65; chromium-100 to 800; copper-250 to 400; mercury-1 to 1.5; manganese-100 to 300; nickel-100 to 200; zinc-4,000 to 12,000; lead-100 to 700; total organic carbon-20,000 to 28,000; phenol-2 to 5; oil and grease-62,000 to 150,000; total PCB-30 40; aldrin-3; naphthalene-2,000; fluorene-69; phenanthrene-200; fluoroanthene-150; acenaphthene-22; acenaphthylene-96; pyrene-140; chrysene-92; benzo (k) fluoroanthene-140; benzo (a) pyrene-87; benzo (b) fluoranthene-140; and benzo (a) anthracene-86; indeno (1,2,3,-c,d)pyrene-50; said composition having 50-80 percent moisture.
 9. A landfill composition containing essentially no free liquid as determined by the paint filter test protocol wherein a 100 ml sample of said composition containing an industrial waste product, placed in a 400 micron conical paint filter for five minutes, passes no water through said filter, said composition comprising a mixture of an industrial waste product and from 5 to 80 weight percent based on the total solids content thereof of finely ground granulated blast furnace slag comprising 30-40 percent SiO₂, 40-45 percent CaO, 10-20 percent Al₂ O₃, 3-10 percent MgO, 1-3 percent S, 0.3-3 percent MnO, 0.3 percent Fe₂ O₃ and a trace of phosphorous, said finely ground granulated blast furnace slag having a Blaine particle size of about 1,800-6,000 sq.cm./g and said landfill composition having a load supportive property ranging from about 0.5 to about 4.5 tons/ft² and a water permeability of about 1×10⁻⁶ cm² /sec or less.
 10. The landfill composition of claim 9 wherein said industrial waste product comprises 1-40 weight percent MgO; 0-25 weight percent V₂ O₅ ; 1-55 weight percent SiO₂ ; 1-85 weight percent Al₂ O₃ ; 0.2-25 weight percent Na₂ O; 4-35 weight percent Fe₂ O₃ ; 1-10 weight percent NiO; 2-55 weight percent CaO; 0.3-4 weight percent SO₃ ; 0.3 weight percent K₂ O; 0-1 weight percent ZnO; 0-4 weight percent P₂ O₅ and 0-3 weight percent TiO₂.
 11. The landfill composition of claim 9 which also includes quick lime in an amount ranging from 5-20 weight percent based on the solids content of said industrial waste product.
 12. The landfill composition of claim 11 which also includes calcium stearate in an amount ranging from 5-10 weight percent based on the solids content of said industrial waste product.
 13. The landfill composition of claim 11 which also includes sodium silicate in an amount of about 15-20 weight percent based on the solids content of said industrial waste product.
 14. The landfill composition of claim 9 which also includes fly ash in an amount of about 20-300 percent by weight based on the solids content of said industrial waste product. 